package com.java.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.java.reggie.common.BaseContext;
import com.java.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * 检查用户是否登录后台
 */
@WebFilter(filterName = "loginCheckFilter",urlPatterns = "/*")
@Slf4j
public class LoginCheckFilter implements Filter {
    //路径匹配器，支持通配符写法
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        //获取本次请求URI
        String requestURI = request.getRequestURI();
        //定义不需要处理的请求路径
        //如果重复跳转login，请在urls放行路径中，添加 /employee/page，因为进入index时候，会自动发起/employee/page请求
        String urls[] = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/sendMsg", //移动端发送短信
                "/user/login"    //移动端登录
        };
        //判断本次请求是否需要处理
        Boolean check = check(urls,requestURI);
        //如果不需要处理，则直接放行
        if(check){
            filterChain.doFilter(request,response);
            return;
        }
        //判断登录状态，已登录直接放行(1)
        if(request.getSession().getAttribute("employee") != null){

            Long empId = (Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(empId);

            filterChain.doFilter(request,response);
            return;
        }
        //判断登录状态，已登录直接放行(2)
        if(request.getSession().getAttribute("user") != null){

            Long userId = (Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(userId);

            filterChain.doFilter(request,response);
            return;
        }
        //如果未登录则返回未登录结果,通过输出流向客户端响应数据
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        log.info("拦截到需要处理请求:{}",request.getRequestURI());
        return;
    }

    /**
     * 检测本次请求是否需要放行
     * @param urls
     * @param requestURI
     * @return
     */
    public Boolean check(String urls[],String requestURI){
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURI);
            if (match){
                return true;
            }
        }
        return false;
    }
}
